Youngins that act like there 80! They generally play chess, where plain clothing, eat bland foods such as soup and hate the young generation. These outcasts of society are usually of an age of 10-19 to be considered "Mutant turtle teenagers".

Craig (A teenager) "Hey guys wanna play some frisbeeee?"

Mr.Peterson (One of the Mutant turtle teenagers) "Oh when this game of chess is over, and let me fetch my extra plain grey sweater"